ICE: Assertion `(Previous.empty() || llvm::any_of(Previous, [](const NamedDecl *ND) { return ND->hasAttr<OverloadableAttr>(); })) && "Non-redecls shouldn't happen without overloadable present"' failed.

[chengniansun]

Bugzilla Link	50848
Version	trunk
OS	All
CC	@DougGregor,@zygoloid

Extended Description

$ clang-trunk -v
clang version 13.0.0 (https://github.com/llvm/llvm-project.git 24d48d45cc302a6abeab139d87ba87f7a2335323)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/cnsun/usr/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/9
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64

$ cat mutant.c
__attribute__((target("sse4.2"))) foo(int) {}
__attribute__((target("arch=sandybridge"))) foo(int);
foo(unsigned) {}

$ clang-trunk  mutant.c
mutant.c:1:35: warning: type specifier missing, defaults to 'int' [-Wimplicit-int]
__attribute__((target("sse4.2"))) foo(int) {}
                                  ^
mutant.c:1:42: warning: omitting the parameter name in a function definition is a C2x extension [-Wc2x-extensions]
__attribute__((target("sse4.2"))) foo(int) {}
                                         ^
mutant.c:1:45: warning: non-void function does not return a value [-Wreturn-type]
__attribute__((target("sse4.2"))) foo(int) {}
                                            ^
mutant.c:2:45: warning: type specifier missing, defaults to 'int' [-Wimplicit-int]
__attribute__((target("arch=sandybridge"))) foo(int);
                                            ^
mutant.c:3:1: warning: type specifier missing, defaults to 'int' [-Wimplicit-int]
foo(unsigned) {}
^
clang-13: /tmp/tmp.nPuVKAIgXI-clang-builder/llvm-project/clang/lib/Sema/SemaDecl.cpp:10974: bool clang::Sema::CheckFunctionDeclaration(clang::Scope*, clang::FunctionDecl*, clang::LookupResult&, bool): Assertion `(Previous.empty() || llvm::any_of(Previous, [](const NamedDecl *ND) { return ND->hasAttr<OverloadableAttr>(); })) && "Non-redecls shouldn't happen without overloadable present"' failed.
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.	Program arguments: /scratch/software/clang-trunk/bin/clang-13 -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all --mrelax-relocations -disable-free -main-file-name mutant.c -mrelocation-model static -mframe-pointer=all -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/scratch/cnsun/workspace/perses-fuzzer/default_c_finding_folder/crash_20210623_042516_0004/delta/perses_result -resource-dir /scratch/software/clang-trunk/lib/clang/13.0.0 -c-isystem . -c-isystem /usr/local/include/cmsith -internal-isystem /scratch/software/clang-trunk/lib/clang/13.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fdebug-compilation-dir=/scratch/cnsun/workspace/perses-fuzzer/default_c_finding_folder/crash_20210623_042516_0004/delta/perses_result -ferror-limit 19 -fgnuc-version=4.2.1 -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/mutant-9e265a.o -x c mutant.c
1.	mutant.c:3:15: current parser token '{'
 #&#8203;0 0x00005621289bf274 PrintStackTraceSignalHandler(void*) Signals.cpp:0:0
 #&#8203;1 0x00005621289bca2e SignalHandler(int) Signals.cpp:0:0
 #&#8203;2 0x00007fcbfee0f3c0 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x153c0)
 #&#8203;3 0x00007fcbfe8ae18b raise /build/glibc-ZN95T4/glibc-2.31/signal/../sysdeps/unix/sysv/linux/raise.c:51:1
 #&#8203;4 0x00007fcbfe88d859 abort /build/glibc-ZN95T4/glibc-2.31/stdlib/abort.c:81:7
 #&#8203;5 0x00007fcbfe88d729 get_sysdep_segment_value /build/glibc-ZN95T4/glibc-2.31/intl/loadmsgcat.c:509:8
 #&#8203;6 0x00007fcbfe88d729 _nl_load_domain /build/glibc-ZN95T4/glibc-2.31/intl/loadmsgcat.c:970:34
 #&#8203;7 0x00007fcbfe89ef36 (/lib/x86_64-linux-gnu/libc.so.6+0x36f36)
 #&#8203;8 0x000056212aeaab0b clang::Sema::CheckFunctionDeclaration(clang::Scope*, clang::FunctionDecl*, clang::LookupResult&, bool) (/scratch/software/clang-trunk/bin/clang-13+0x5e3bb0b)
 #&#8203;9 0x000056212aeb0601 clang::Sema::ActOnFunctionDeclarator(clang::Scope*, clang::Declarator&, clang::DeclContext*, clang::TypeSourceInfo*, clang::LookupResult&, llvm::MutableArrayRef<clang::TemplateParameterList*>, bool&) (/scratch/software/clang-trunk/bin/clang-13+0x5e41601)
#&#8203;10 0x000056212aeb4011 clang::Sema::HandleDeclarator(clang::Scope*, clang::Declarator&, llvm::MutableArrayRef<clang::TemplateParameterList*>) (/scratch/software/clang-trunk/bin/clang-13+0x5e45011)
#&#8203;11 0x000056212aeb4c17 clang::Sema::ActOnStartOfFunctionDef(clang::Scope*, clang::Declarator&, llvm::MutableArrayRef<clang::TemplateParameterList*>, clang::Sema::SkipBodyInfo*) (/scratch/software/clang-trunk/bin/clang-13+0x5e45c17)
#&#8203;12 0x000056212abdf48f clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/scratch/software/clang-trunk/bin/clang-13+0x5b7048f)
#&#8203;13 0x000056212ac0c1c0 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/scratch/software/clang-trunk/bin/clang-13+0x5b9d1c0)
#&#8203;14 0x000056212abda066 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributesWithRange&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/scratch/software/clang-trunk/bin/clang-13+0x5b6b066)
#&#8203;15 0x000056212abda651 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributesWithRange&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (.part.0) Parser.cpp:0:0
#&#8203;16 0x000056212abe0e57 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributesWithRange&, clang::ParsingDeclSpec*) (/scratch/software/clang-trunk/bin/clang-13+0x5b71e57)
#&#8203;17 0x000056212abe23ee clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, bool) (/scratch/software/clang-trunk/bin/clang-13+0x5b733ee)
#&#8203;18 0x000056212abd4c39 clang::ParseAST(clang::Sema&, bool, bool) (/scratch/software/clang-trunk/bin/clang-13+0x5b65c39)
#&#8203;19 0x0000562129b1bf98 clang::CodeGenAction::ExecuteAction() (/scratch/software/clang-trunk/bin/clang-13+0x4aacf98)
#&#8203;20 0x00005621293cae79 clang::FrontendAction::Execute() (/scratch/software/clang-trunk/bin/clang-13+0x435be79)
#&#8203;21 0x000056212935e0c6 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/scratch/software/clang-trunk/bin/clang-13+0x42ef0c6)
#&#8203;22 0x00005621294a8d00 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/scratch/software/clang-trunk/bin/clang-13+0x4439d00)
#&#8203;23 0x00005621262cfb06 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/scratch/software/clang-trunk/bin/clang-13+0x1260b06)
#&#8203;24 0x00005621262cbe48 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) driver.cpp:0:0
#&#8203;25 0x00005621261f90c6 main (/scratch/software/clang-trunk/bin/clang-13+0x118a0c6)
#&#8203;26 0x00007fcbfe88f0b3 __libc_start_main /build/glibc-ZN95T4/glibc-2.31/csu/../csu/libc-start.c:342:3
#&#8203;27 0x00005621262cb9be _start (/scratch/software/clang-trunk/bin/clang-13+0x125c9be)
clang-13: error: unable to execute command: Aborted (core dumped)
clang-13: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 13.0.0 (https://github.com/llvm/llvm-project.git 24d48d45cc302a6abeab139d87ba87f7a2335323)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/cnsun/usr/bin
clang-13: note: diagnostic msg:
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-13: note: diagnostic msg: /tmp/mutant-720ba0.c
clang-13: note: diagnostic msg: /tmp/mutant-720ba0.sh
clang-13: note: diagnostic msg:

********************

[tahonermann]

This issue has been fixed in Clang trunk for Clang 15.

Previously, compilation aborted with an assertion failure in an asserts-enabled build and failed with a error: at most one overload for a given name may lack the 'overloadable' attribute diagnostic in a non-asserts-enabled build. Following the changes made in commit 8b6f1cbb21c58e255156aa32ac55530c807055a9, no assertion failures occur and a error: function declaration is missing 'target' attribute in a multiversioned function diagnostic is issued. See https://godbolt.org/z/31WrWofab. Changes to diagnose the type mismatch before diagnosing the missing target attribute would be a welcome improvement. In fact, such a diagnostic is currently missing; adding a target attribute to the last declaration suffices for compilation to be (incorrectly) successful. I filed issue #54892 to follow up on this.

[llvmbot]

@llvm/issue-subscribers-clang-frontend